Here is an overview of the extensions of ZK. They are optional. If you are new to ZK and prefer have some knowledge of ZK first, you could skip this section and come back later after you understand more about ZK.

Use this plugin's embedded Jetty distribution to run web applications in Eclipse. This helps to speed up the ZK development by minimizing the deployment time. The project is maintained by Tony Wang, a member of the ZK Team.

ZUSS (ZK User-interface Style Sheet) is an extension to CSS. It is compatible with CSS, while allows the dynamic content, such as variables, mixins, nested rules, expressions, and Java methods with existing CSS syntax.